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A non-conducting sphere with radius R = 2.50 cm and a charge q = 3x10^-15 C which is evenly distributed. If the electric potential at

A non-conducting sphere with radius R = 2.50 cm and a charge q = 3x10^-15 C which is evenly distributed. If the electric potential at the center of the sphere is zero, what is the electric potential at

(a) r= R?

(b) r=2 cm?

Please help me

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